a political system or state in which the government is formed of old people
For decades our nation has in effect been ruled by a gerontocracy. The time has come to give power to the nation's youth by opening the highest government posts to the young.
geron gerontos (old man)#kratia (rule)
by etymology gerontos means old people and cracy mens govt. (eg. democracy, autocracy etc. ). therefore gerontocracy is the govt. formed by old people.